KR100527650B1 - Heating element holding plate, manufacturing method thereof, and smoking agent filling container - Google Patents

Abstract

In the heating element holding plate which is provided with a mounting hole for mounting the ignition heating element of the smoke agent and a plurality of dust holes, and fixed in a container filled with the smoke agent, the heating element for ignition can be easily mounted, and It is a problem to improve the holding force of the ignition heating element.

In order to solve the above problems, a plurality of divided into approximately equal intervals by a plurality of dividing grooves 10 at the periphery of the mounting hole 9 of the heating element retaining plate 8 and bent to be elastically expandable in diameter. The support piece 11 of was formed.

Description

Heating element holding plate and manufacturing method thereof, and smoke container filling container {HEATING ELEMENT HOLDING PLATE, MANUFACTURING METHOD THEREOF, AND SMOKING AGENT FILLING CONTAINER}

The present invention relates to a heating element holding plate for use in a smoker filling container used for pest control and antibacterial antiseptic and a manufacturing method thereof, and a smoker filling container comprising the heating element holding plate.

Smokers are widely used as a means for controlling pest control and dustproof dustproofing in a closed space such as indoors, and a smoker filling container filled with such smokers has been put into practical use.

As shown in FIG. 6 and FIG. 7, the smoke container filling container is generally composed of a metal container including an accommodating part 103 and an upper cover 102 in which the smoke agent 104 is accommodated.

The upper cover 102 is formed with a central hole 107 through which the ignition head 106 of the heating element 105 for ignition is exposed and a plurality of fume holes (not shown). The heating element holding plate 108 on which the heating element 105 is mounted is mounted.

In addition, the heating element holding plate 108 is provided with a mounting hole 109 for mounting the ignition heating element 105 and a plurality of smoke separation holes (not shown), and the mounting hole 109 is an ignition heating element 105. The edge is raised up so that it can be maintained.

Such a smoke pack filling container is usually used in a state in which a heat-resistant outer cylinder such as a paper tube is fitted, for example, in a state of being accommodated in a synthetic resin outer container.

As shown in FIGS. 6 and 7, the smoke pack filling container rubs and ignites the ignition head 106 of the ignition heating element 105 with a friction plate, whereby the heating agent inside the ignition heating element is burned, and the smoke agent 104 is heated by the heat. Is smoked, and smoke is discharged to the outside through the fume holes of the heat generating plate 108 and the upper cover 102.

However, the heating element retaining plate 108 to which the conventional ignition heating element 105 is mounted has a plurality of perforations (metal plate with holes) in its entire surface, or a disk shape using an unprocessed metal plate. A randomly shaped hole (a randomly shaped hole in which the plurality of perforations are integrated with the mounting hole) is formed around the mounting hole formed in the center, and in the latter case, the mounting hole is simply circular.

For this reason, when the periphery of the mounting hole 109 is raised, in the former example, the insertion strength at the time of mounting the ignition heating element 105 increases, so that the plate thickness is increased in order to prevent deformation of the heating element holding plate 108. It was necessary to thicken and became obstacle of material cost reduction. In the latter example, the raised portion of the periphery of the mounting hole requires a large force when the ignition heating element 105 is mounted because the diameter thereof cannot be expanded elastically almost, whereas the ignition of the ignition heating element 105 is performed. When the head 106 is rubbed with a friction plate to ignite, there is a problem that the ignition heating element 105 is likely to fall out of the mounting hole 109.

The present invention solves the problems of the prior art, realizes a material cost reduction by thinning the plate, and at the same time, a heating element holding plate having a novel structure capable of increasing the holding force of the mounted ignition heating element, and a heating element holding plate. It is an object of the present invention to provide a manufacturing method capable of efficiently manufacturing and a smoke-filling container comprising the heating element holding plate.

Means to solve the problem

The configuration of the present invention made to achieve the above object is as follows.

That is, the heating element retaining plate of the present invention is a heating element retaining plate in which a mounting hole for mounting a heating element for ignition of a smoke agent and a plurality of smoke holes are formed and fixed in a container filled with a smoke agent,

A plurality of support pieces are formed in the circumferential edge of the mounting hole at a substantially equal interval by a plurality of dividing grooves and are bent to be elastically enlarged in diameter.

According to the heating element retaining plate of the present invention, a plurality of support pieces which are separated at substantially equal intervals by the dividing grooves and are bent to be elastically enlarged in diameter are formed in the circumferential edge portion of the mounting hole. Moreover, 2-20 are preferable and, as for the number of several support pieces, 3-9 are more preferable.

The support piece, which can be elastically enlarged in diameter, can absorb the force at the time of mounting the ignition heating element, so that the mounting hole of the heating element holding plate can be easily carried out with a relatively small load of 196 N (20 kgf) or less, on average, 98 N (10 kgf). The heating element for ignition can be attached.

In addition, in order to drop the ignition heating element, a load of 98 N (10 kgf) or more can be maintained by the elastic force of the support, and the holding force can be maintained at a high holding force. Falling out of the hole can be prevented. In addition, the bending direction and angle of the support piece can be appropriately designed depending on the shape of the ignition heating element.

The ignition heating element held by the heating element holding plate of the present invention has a plurality of convex portions around the mounting portion with respect to the heating element holding plate, and it is preferable that the convex portions are formed more than the division grooves. According to this configuration, when the ignition heating element is mounted in the mounting hole of the heating element holding plate, the convex portion of the ignition heating element and the dividing groove of the heating element holding plate do not completely coincide with each other, so that the holding force of the ignition heating element is effectively maintained. Can improve. In addition, the convex portion of the ignition heating element can obtain the same effect even under undercut.

It is also preferable that the plurality of dusting holes are formed centering on the mounting holes, and convex rigid reinforcing portions are formed in the periphery of these powdering holes. According to such a structure, since the said convex part can reinforce the planar rigidity of the heat generating body holding plate reduced by formation of a plurality of smoke spacing holes, the thickness of a heat generating body holding plate can be made thin and manufacturing cost can be reduced. In addition, the form of the convex rigid reinforcing portion formed around the fume hole is not particularly limited as long as it can effectively reinforce the heating element retaining plate. For example, a plurality of convex portions may be formed between the plurality of fume holes, One or more ring-shaped convex portions can be formed on the concentric circle around the smoke spacing hole, or a series of convex portions can be formed around the smoke spacing hole.

The present invention includes a smoke pack filling container characterized by comprising the above-described heating element holding plate of the present invention.

In addition, the manufacturing method of the heating element retaining plate of the present invention includes a mounting hole for mounting a ignition heating element made of a smoke agent, a plurality of smoked holes formed around the mounting hole, and a convex-shaped rigid reinforcement formed around the smoked hole. As a manufacturing method of a heating element holding plate which is fixed in a container filled with a smoke agent,

A first step of forming a mounting hole having a plurality of dividing grooves at substantially equal intervals on a substrate made of a coil material and forming a part of the plurality of smoke dividing holes;

A second step of bending the outer portion of the heating element holding plate and the mounting hole circumferential edge portion separated by the dividing groove, and simultaneously forming the rigid reinforcing portion;

A third step of forming the remainder of the plurality of smoke spacing holes;

It has a 4th process of removing a heat generating body holding plate in the said external part from the said board | substrate. It is characterized by the above-mentioned.

In addition, the coil material in this invention means the metal plate shape | molded in the coil shape which consists of metals, such as a tin-free steel, a galvanized steel plate, a stainless steel plate, an aluminum plate, and a tin-plated steel plate.

In addition, another method of manufacturing a heating element retaining plate of the present invention includes a mounting hole for mounting a ignition heating element of a smoke agent, a plurality of smoked holes formed around the mounting hole, and a convex rigidity formed around the smoked hole. As a manufacturing method of a heating element holding plate having a reinforcing part and fixed in a container filled with a smoke agent,

A first step of forming a mounting hole having a plurality of dividing grooves at substantially equal intervals on a substrate made of a coil material and forming a part of the plurality of smoke dividing holes;

A second step of bending the outer portion of the heating element holding plate and simultaneously forming the rigid reinforcing portion;

A third step of bending the circumferential edge of the mounting hole separated by the dividing groove and forming the remainder of the plurality of fume holes;

It has a 4th process of removing a heat generating body holding plate in the said external part from the said board | substrate. It is characterized by the above-mentioned.

According to the manufacturing method of the present invention, in particular, by forming the plurality of smoked holes divided into the first step and the third step, the molds used in each step can be further simplified, and the durability thereof can be improved. In addition, since the rigid reinforcement part is formed in the board | substrate which provided the mounting hole and some part of the fume holes in the 1st process, and the planar rigidity of the board | substrate is improved in the 3rd process, Deformation and the like can be prevented, and the product can be continuously and efficiently manufactured as designed.

Embodiment of the invention

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment example of this invention is described, this invention is not limited to these examples.

First, the heat generating plate holding plate of the present invention will be described with reference to FIGS. 1 and 2.

1 is a partial cutaway cross-sectional view showing an example of a smoke pack filling container equipped with a heating element holding plate of the present invention. 2: is a figure which shows this heat generating body holding plate, (a) is a top view, (b) is partial sectional drawing of A-A 'in (a), (c) is an enlarged view of the B part in (b).

As shown in FIG. 1 and FIG. 2, the smoke pack filling container 1 of this example mainly consists of the metal container which consists of the accommodating part 3 and the upper cover 2 in which the smoke agent 4 is accommodated.

The upper surface of the upper cover 2 is formed with a central hole 7 and a plurality of fume holes (not shown) in which the ignition head 6 of the ignition heating element 5 is exposed, and also inside the upper cover 2. The heating element holding plate 8 equipped with the heating element 5 for ignition is mounted.

In the center of the heating element holding plate 8, a mounting hole 9 for mounting the ignition heating element 5 is formed, and a plurality of semicircular shapes are provided in the peripheral portion of the mounting hole 9 (five in this example). The dividing grooves 10) are formed at equal intervals. The peripheral portion of the mounting hole 9 separated by the dividing groove 10 is bent upward by a predetermined angle (about 77 ° in this example) to form a plurality of support pieces 11.

Further, the bending angle of the plurality of support pieces is preferably less than 90 °, more preferably 50 ° or more and less than 90 °.

The plurality of support pieces 11 that are bent in a tapered shape as described above can be elastically enlarged in diameter when the ignition heating element 5 is mounted in the mounting hole 9 from below, so that the ignition heating element is relatively small. (5) can be mounted, and after mounting, the ignition heating element 5 can be effectively supported by the elastic force. In this regard, some experimental results are presented and described in more detail.

Table 1 shows the insertion strength and deformation of the heating element retaining plate when the heating element 5 for ignition is mounted on the heating element retaining plate 8 and the conventional heating element retaining plate (using a metal plate with a hole and a raw metal plate). The test results for the dropout strength of the installed ignition heating element and the dropout during ignition are shown. In addition, the measuring method of the insertion strength and dropping strength in Table 1 is as follows.

(Measurement of Insertion Strength)

The ignition heating element was inserted into the mounting hole of the heating element holding plate, and the maximum load required for mounting at the proper position was measured by a straw graph (test speed 100 mm / min).

(Measurement of Dropout Strength)

The maximum load required to drop the ignition heating element mounted on the heating element holding plate from the mounting hole (including the case where the heating element holding plate is not dropped and is deformed) was measured by a straw graph (test speed 100 mm / min).

Mounting Hole Features Plate thickness (mm) Insertion strength (kgf) Transformation upon insertion Dropout strength (kgf) Falling on ignition MIN MAX AV MIN MAX AV The present invention A plurality of support pieces are formed in the periphery of the mounting hole by a plurality of dividing holes at substantially equal intervals and bent to be elastically expandable in diameter. 0.21 2 7 3 radish 11 17 13 radish 0.23 3 5 4 radish 15 23 18 radish 0.32 5 18 8 radish 10 36 28 radish 0.4 7 20 10 radish 15 26 23 radish Prior art Perforated Metal Plate Randomly shaped holes in which a plurality of perforations are integrated with the mounting holes 0.4 7 32 23 radish 10 36 18 radish Raw metal plate It is impossible to expand elastically with simple circle 0.24 4 28 17 U 0 16 4 U 0.28 7 10 8 radish 4 8 6 U

As shown in Table 1, the heating element retaining plate according to the present invention can mount the heating element 5 for ignition with a relatively small load of 196 N (20 kgf) or less, on average, 98 N (10 kgf) or less, even when the insertion strength is maximum. In case of dropping after mounting, it was confirmed that more than 98N (10kgf) was required due to the elastic force.

In addition, the dropping of the ignition heating element 5 was not confirmed by the deformation of the mounting hole 9 at the time of insertion or the ignition operation of pressing the ignition head 6 strongly from the top and rubbing it.

On the other hand, in the prior art, in the case of a perforated metal plate, the insertion strength is up to 314 N (32 kgf), and on average, 225 N (23 kgf), which requires a large load to mount the ignition heating element 5 in comparison with the heating element holding plate according to the present invention. . In the case of a raw metal plate, a load of up to 274 N (28 kgf) is required, but since there is little elasticity, the dropout strength is 0 N (0 kgf), and the dropout is caused by deformation of the mounting hole 9 during insertion or ignition operation after mounting. It can be seen that it generates.

In this example, the semicircular cutout is formed as the dividing groove 10. The dividing groove is not particularly limited as long as it can separate the peripheral portion of the mounting hole 9 at approximately equal intervals, and is not limited to the cutout portion. It may be formed as a simple slit, or may further be formed in the form of a continuous wave shape in which the convex portion serving as the support piece and the concave portion serving as the dividing groove are formed.

In the heat generator retaining plate 8 of the present example, a plurality (15 in this example) of the part of the fume holes 12 are formed radially with the mounting hole 9 as the center. These smoke holes 12 ignite the ignition head 6 of the ignition heating element 5 with a friction plate or the like, thereby burning the heat generating agent inside the ignition heating element, and when the smoke 4 smokes by the heat, Will be the release of.

In this example, fifteen long ones were formed as the fume holes 12, but the shape and the number of the fume holes 12 can be appropriately designed according to the amount of fumes. For example, the shape may be round, rectangular, elliptical, or any combination thereof. Moreover, the number is about 1-30 pieces. Moreover, the ratio of the total opening area of the smoke-fueling holes 12 to the opening area of the plurality of smoke-fueling holes (not shown) formed in the upper surface of the upper cover 2 so that the smoke state from the smoke-filling container 1 becomes desirable. It is preferable that is 1-8.

In addition, a plurality of convex rigid reinforcing portions 13 are formed in the same radial shape between the smoke dividing holes 12, and the planar rigidity of the heating element retaining plate 8 reduced by the formation of the plurality of smoke dividing holes 12 is reduced. This is effectively reinforced. In the conventional general heating element holding plate, a metal plate having a thickness of 0.4 mm or more is used, but by forming such rigid reinforcing portions 13 at appropriate positions, a metal plate having a thickness of about 0.3 mm can be used.

In this example, five long circular stiffeners were formed as the stiffeners 13, and the shape, position, and number of the stiffeners 13 were taken into consideration of the strength of the heating element holding plate itself and the mounting and holding force of the ignition heating element. Can be appropriately designed. However, in the case where a plurality of smoke spacing holes are formed radially around the mounting hole 9 as in the present example, it is preferable to form a rigid reinforcing portion having the above shape evenly between these smoke spacing holes, thereby very effectively. The plane rigidity of the heating element holding plate can be increased.

Moreover, the outer peripheral part 14 of the heat generating body holding plate 8 is lowered as shown in FIG. The outer circumferential portion 14 facilitates the mounting of the heating element holding plate 8 to the upper cover 2 and prevents the dropping from the upper cover 2 by the elastic force. In the outer peripheral portion 14, for example, an adhesive or the like can be used in combination to fix the upper lid 2.

As the heating element 5 for ignition held by the heating element holding plate of the present invention, for example, as shown in FIG. 3, a plurality of convex portions 16 at equal intervals around the mounting portion 15 which is a part which is in contact with the heating element holding plate. ) Is preferably formed. This convex portion 16 makes the fitting of the ignition heating element 5 to the mounting hole 9 of the heating element holding plate 8 more firm. In this case, it is preferable to form more convex portions 16 than the division grooves 10. By designing in this way, when the ignition heating element 5 is mounted in the mounting hole 9 of the heating element holding plate 8, the convex portion 16 and the division groove 10 of the ignition heating element 5 are mutually different. It does not coincide completely, and the ignition heating element 5 can be maintained with high holding force.

As described above, for example, as shown in FIG. 4, the above-described smoke-filling container is used in a state in which a heat-resistant outer cylinder 17 made of a paper tube or the like is fitted, and accommodated in an outer container 18 such as a synthetic resin. In addition, 19 in FIG. 4 is the upper cover of the exterior container 18. As shown in FIG.

Next, the manufacturing method of the heat generating body holding plate of this invention is demonstrated using FIG.

FIG. 5 shows an example of the method of manufacturing the heat generator retaining plate of the present invention continuously, and is an example of manufacturing the heat generator retaining plate 8 as shown in FIG. 2. Hereinafter, the characteristic of the manufacturing method of this invention is demonstrated according to a process sequence.

(First process)

In the center of the width direction of the coil-shaped board | substrate 50, the mounting hole 9 which has five division grooves 10 at substantially equal intervals in the circumferential edge part, and the length radially centering on this mounting hole 9 Form five long circular holes 12. In addition, in this example, circular positioning holes 51 were simultaneously formed in the vicinity of both end portions of the substrate 50 in order to increase the transfer accuracy of the coil-shaped substrate 50. The positioning hole 51 is equipped with a pilot pin with a tapered tip in the upper mold in a subsequent process, and the pilot pin enters the positioning hole 51 to move the coil material at the same time as the press slide is lowered. To increase the precision of the transmission pitch. Further, the coil material should be free at the moment when the tip of the pilot pin enters the positioning hole 51, so that the coil material holding by the clamp of the transmission device is set to open at that time.

(Second process)

Taping edges of the mounting holes separated by the outer portion (outer peripheral portion 14) and the dividing groove 10 of the heating element retaining plate to be manufactured are bent in a tapered shape in a predetermined direction to form the support piece 11, and at the same time, the mounting hole 9 Five convex parts (rigid reinforcement part 13) are formed radially centering on.

(Third process)

The remaining ten fume holes 12 are formed radially around the mounting hole 9.

It is necessary to secure the fume hole of the heating element holding plate to a predetermined area or more, and the plurality of long-sized circular fume holes formed in the present example are in close proximity to each other. For this reason, when it is going to mold-cut all these fume holes at once, the fall of durability of a metal mold becomes a problem. However, as described above, the formation of the plurality of smoke spacing holes 12 can be formed by dividing the first and third processes at a distance from each other to improve the durability of the mold.

(Fourth process)

From the board | substrate 50, the heat generating body holding plate is removed from the outline part (outer peripheral part 14). As a result, a heat generating plate 8 as shown in FIG. 2 is obtained.

As described above, according to the manufacturing method of the present invention, in particular, the formation of a plurality of fume holes is formed by dividing the first step and the third step, thereby simplifying the mold structure used in each step and improving the durability thereof. In the first step, the substrate is formed with mounting holes and a part of the fume holes, and in the second step, the rigid reinforcing part is formed to increase the planar rigidity of the substrate. Deformation and the like can be prevented, and the product can be continuously and efficiently manufactured as designed.

In addition, in the manufacturing method of this invention, according to the diameter of the heat generating body holding plate manufactured, specifically, when the diameter of a heat generating body holding plate is large, for example, bending of the mounting part periphery of a mounting hole in a 2nd process is carried out 3rd. You may implement in a process. As a result, dispersion of deformations associated with the substrate and improvement in product dimension precision can be expected.

As described above, according to the heating element retaining plate of the present invention, the circumference of the heating element for ignition can be uniformly supported by a plurality of support pieces that are separated at approximately equal intervals by the dividing grooves and are bent to be elastically enlarged in diameter. At the same time, since the support piece whose diameter is elastically expandable can absorb the force at the time of mounting the heating element for ignition, the heating element for ignition can be easily mounted in the mounting hole of the heating element holding plate, and the ignition force is caused by the elastic force of the support piece. Since the heating element can be maintained at a high holding force, the ignition heating element can be effectively prevented from falling out from the mounting hole when the ignition head of the ignition heating element is rubbed with a friction plate or the like.

In particular, when the ignition heating element has a plurality of convex portions around the mounting portion with respect to the heating element holding plate, and this convex portion is formed more than the dividing grooves formed in the periphery of the mounting hole of the heating element holding plate. The convex portion makes the fitting of the ignition heating element more tightly fitted to the mounting hole of the heating element holding plate, so that the holding force of the ignition heating element can be improved more effectively.

In particular, in the case where a plurality of smoke-reinforcing holes are formed, for example, radially around the mounting holes, and convex rigid reinforcing portions are formed in the periphery of the smoke-reducing holes, which form a long circle, a ring shape, or the like, The planar rigidity of the heating element retaining plate reduced by the formation of a plurality of smoke spacing holes can be effectively reinforced, and the thickness of the heating element retaining plate can be reduced, thereby reducing the manufacturing cost.

According to the manufacturing method of the heating element holding plate of the present invention, since the formation of a plurality of smoke spacing holes is formed by dividing into a first step and a third step, the mold structure used in each step can be simplified to improve its durability. Since the rigid reinforcement part is formed in the board | substrate which provided the mounting hole and some part of the fume hole in the 1st process, and the planar rigidity of the board | substrate is improved in the 2nd process, the deformation | transformation of a board | substrate, etc. at the time of forming the remaining fume hole in the 3rd process, etc. Can be prevented. Thereby, a product can be manufactured continuously and efficiently by little process water as designed.

1 is a partially cutaway view showing an example of a smoke pack filling container of the present invention.

2 is a view showing an example of a heating element holding plate used in the smoke pack filling container of the present invention.

3 is a view showing an example of an ignition heating element used suitably for the smoke pack filling container of the present invention.

4 is a partially cutaway view showing a state in which the smoker filling container of FIG. 1 is kept in an outer container.

5 is a view for explaining an example of the manufacturing method of the heating element holding plate of the present invention.

6 is a cross-sectional view of a conventional smoke container filling container.

FIG. 7 is an exploded view of the smoker filling container of FIG. 6. FIG.

* Description of the symbols for the main parts of the drawings *

1: Filling container smoked 2: Top cover

3: accommodating part 4: smoking agent

5: ignition heating element 6: ignition head

7: center hole 8: heating element holding plate

9: mounting hole 10: split groove

11: support piece 12: smoke hole

13: Rigid reinforcing part 14: Outer peripheral part of the heating element holding plate

15: mounting portion 16: convex shape

17: heat resistant outer cylinder 18: outer container

19: top cover of the outer container 50: substrate (coil material)

51: positioning hole 102: upper cover

103: accommodating part 104: smoked agent

105: heating element for ignition 106: ignition head

107: center hole 108: heating element holding plate

109: mounting hole

Claims (5)

In the heating element holding plate which is provided with a mounting hole for mounting a heating element for ignition of the smoke agent and a plurality of smoke separation holes, and fixed in a container filled with the smoke agent, And a plurality of support pieces which are separated at substantially equal intervals by a plurality of dividing grooves and are bent so as to be elastically enlarged in diameter at a peripheral edge of the mounting hole. 2. The heating element holding plate according to claim 1, wherein the plurality of dusting holes are formed around the mounting hole, and a convex rigid reinforcing part is formed around these smoked holes. The heating element holding plate of Claim 1 or 2 characterized by the above-mentioned. A heating element which has a mounting hole for mounting a ignition heating element of a smoke agent, a plurality of smoke-reinforced holes formed centering on the mounting hole, and a convex-shaped rigid reinforcement formed around the smoke hole, and fixed in a container filled with a smoke agent. As a manufacturing method of the plate, A first step of forming a mounting hole having a plurality of dividing grooves at substantially equal intervals on a substrate made of a coil material, and forming a part of the plurality of smoke dividing holes; A second step of bending the outer edge portion of the heating element holding plate and the mounting hole circumferential edge portion separated by the dividing groove, and forming the rigid reinforcement portion; A third step of forming the remainder of the plurality of smoke spacing holes; And a fourth step of removing the heating element retaining plate from the outer surface portion from the substrate. A heating element which has a mounting hole for mounting a ignition heating element of a smoke agent, a plurality of smoke-reinforced holes formed centering on the mounting hole, and a convex-shaped rigid reinforcement formed around the smoke hole, and fixed in a container filled with a smoke agent. As a manufacturing method of the plate, A first step of forming a mounting hole having a plurality of dividing grooves at substantially equal intervals on a substrate made of a coil material, and forming a part of the plurality of smoke dividing holes; A second step of bending the outer portion of the heating element holding plate and forming the rigid reinforcing portion; A third step of bending the mounting periphery of the mounting hole separated by the dividing groove, and forming the remainder of the plurality of smoke dividing holes; And a fourth step of removing the heating element retaining plate from the outer surface portion from the substrate.